Coffee machine



FIG. 1 is a perspective view of a coffee machine in accordance with my invention thereof;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a back view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in FIG. 8 are included for the purpose of illustration and form no part of the claimed design. 

The ornamental design for a coffee machine, as shown and described. 